—Smart phones are more and more popular now.—So they are. But they still ________ too much.

---Excuse me, Sir. But smoking is not allowed here.---Sorry, I didn’t see the sign. I’ll _______ my cigarette at once.

 David visited lots of _______ in the world. 

---What are the police doing there? ---They are _______ the building. A robber ran into it just now.

—Never      the lions and tigers. They’re too dangerous.    —Oh, I see. Thank you.